KR20140137478A - Pipe line arrangement for dual fuel engine - Google Patents

Abstract

The present invention relates to a structure for arranging a pipeline and a cylinder head such as a main feed pipe and a cooling water pipe for supplying gaseous fuel to a cylinder, a pipe arrangement structure of a dual fuel engine . In the pipeline arrangement structure of the dual fuel engine according to the present invention, the gas fuel main feed pipe 120 is connected to the cylinder head block 30 in a line extending vertically from the inside end of the main feed pipe 120 in the left- And the lower end of the main feed pipe 120 is positioned in the upper portion of the cylinder head cover 40, 50 in the up-and-down direction, while the gap G2 is maintained at a position further away from the line extending from the vertically extending outer end Positioned higher than the surface; Connecting the main feed pipe 120 to the gas inlet valve 160 on the upper surface of the cylinder head block 30 to the distribution pipe 140; A line extending vertically from the outer end of the main cooling water pipe 180 between the cylinder head covers 40 and 50 and the main feed pipe 120 in the right and left direction is connected to the main feed pipe 120 The cylinder head block 30 is positioned so as to be positioned at a position spaced apart from the line extending vertically from the inner end of the cylinder head block 30 in the inward direction while maintaining the gap G3 at the upper end thereof; The cooling water distribution pipe 190 is connected from the main cooling water pipe 120 to the water jacket inlet on the upper surface of the cylinder head block 30.

Description

[0001] PIPE LINE ARRANGEMENT FOR DUAL FUEL ENGINE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a piping arrangement structure of an engine using a dual fuel, and more particularly, to a piping arrangement structure of a main fuel feed pipe and a cooling water pipe, And to facilitate the removal, installation, and maintenance of the dual fuel engine.

In a gas carrier such as liquefied natural gas (LNG), gas fuel stored in a storage tank is easily used as fuel, and gas used in the tank is not re-liquefied. And a dual fuel engine that selectively or simultaneously uses gaseous fuel. In the case of diesel engines used in power generation facilities of offshore structures, marine structures, or plants using gas such as LNG or LPG, dual fuel engines that can use gaseous fuels are also introduced.

The dual-fuel engine (diesel engine) has a gas fuel operating mode using gaseous fuel and an oil fuel operating mode using oil fuel (e.g., Marine Diesel Oil, Heavy Fuel Oil, etc.) In the mixed operation mode.

The oil fuel is injected into the combustion chamber by an oil fuel injector provided in each cylinder head. The gaseous fuel is distributed from the main feed pipe to each cylinder-specific distribution pipe, and then the gas amount is regulated in a gas admission valve (GAV) And is injected into the intake port of the cylinder head through the gas injector.

Since the dual fuel engine is based on a diesel engine that self-ignites by compressing the intake air to high temperature and high pressure unlike a gasoline engine that ignites the fuel by spark plug, it induces ignition of the gas fuel And a pilot injector (Micro Pilot Injector) as a small-sized oil fuel injector.

Since gas fuels such as natural gas have a low self-ignition temperature and a high self-ignition temperature of around 550 ° C, just before injecting the main fuel, gaseous fuel in the gas fuel operating mode, A pilot injection process (pilot injection process) by injecting pilot oil (eg, Marine Diesel Oil, Marine Gas Oil, etc.) by injecting a small amount of fuel through the injector can stably ignite the gaseous fuel.

In addition, even in the oil fuel operation mode, the pilot oil is injected in a minute amount through the pilot injector immediately before injecting the main fuel to improve the combustion environment of the combustion chamber, thereby improving the NOx and improving the combustion performance.

1 is a view showing a gas fuel supply circuit provided on the engine side of a dual fuel engine.

Referring to FIG. 1, the gas fuel supply system attached to the dual fuel engine is a part that receives gaseous fuel from an external supply system including a gas storage tank, a pump, a gas pipe, etc., A main feed pipe 12 connected to the connecting pipe 10 and provided adjacent to the cylinder head 2 and a main feed pipe 12 connected to the main feed pipe 12 for each cylinder head 2 And a gas inlet valve (GAV) 16 connected to the end of the distribution pipe 14 and mounted on the cylinder head 2 to regulate the amount of feed gas. The gas inlet valve 16 adjusts the amount of gas and injects the gas to the intake port formed in the cylinder head 2 through the gas injector.

The gas fuel supply system in the above dual fuel engine is composed of a double wall pipe in which two pipes are arranged concentrically at intervals so that gas fuel flows in the inner pipe and air flows in the outer pipe , Which prevents the risk of explosion if gaseous fuel leaks from the inner tube. That is, the connecting pipe 10, the main feed pipe 12, the distribution pipe 14, the gas inlet valve 16, and the like are both formed in a double pipe shape.

As such, the dual fuel engine requires a number of complex pipelines and components due to the nature of the two fuel feed systems.

Therefore, in the alignment of the cylinder head and the pipeline and the peripheral elements constituting the dual fuel engine, the structural stability of the dual fuel engine, the space design in the ship, the convenience of design change in the future, the possibility of quick response during emergency maintenance, The convenience of the ship or the convenience of ship assembly.

Also, for the installation and maintenance of the apparatus, the pipeline layout design should not interfere with the assembly and removal of other elements in the vicinity.

In this regard, the connecting pipe 10, the main feed pipe 12, the distribution pipe 14, and the cylinder 2 must not only functionally cooperate with each other but also must not interfere with each other structurally, It should be designed to harmonize with adjacent structures (pipelines) without spatially interfering.

Open Patent Publication No. 10-2012-0126756 (published on 21.11.2012) Published Patent Publication No. 10-2008-0078504 (Published Aug. 27, 2008) Patent Registration No. 10-0748734 (registered on August 6, 2007)

SUMMARY OF THE INVENTION The present invention has been accomplished in order to satisfy the above circumstances, and it is an object of the present invention to provide a dual fuel engine in which an arrangement structure of a main feed pipe and a cooling water pipe and a cylinder head for supplying gaseous fuel to a cylinder, To a pipeline arrangement structure of a dual fuel engine which allows maintenance to be carried out conveniently.

In order to achieve the above object, a fuel gas pipe arrangement structure for a dual fuel engine according to the present invention is characterized in that a cylinder head block is mounted for each cylinder on an upper portion of an engine block, An engine; A gap G2 is formed between the gas feed main feed pipe and the main feed pipe in the left and right direction at a position where a line extending vertically from the inner end of the main feed pipe is further outwardly from a line extending vertically from the outer end of the cylinder head block And the lower end of the main feed pipe is positioned higher than the upper surface of the cylinder head cover in the up and down direction; Connecting from the main feed pipe to the gas inlet valve on the upper surface of the cylinder head block to a distribution pipe; A line extending vertically from the outside end portion of the main cooling water pipe between the cylinder head cover and the main feed pipe in the left-right direction is formed in the inner side from a line extending vertically from the inside end portion of the main feed pipe (G3) to be located at a position deviating from the center of the cylinder head block and positioned above the cylinder head block in a vertical direction; And the cooling water distribution pipe is connected from the main cooling water pipe to the water jacket inlet on the upper surface of the cylinder head block.

In one embodiment, the distribution pipe is formed of a curved shape having one end connected to the side of the main feed pipe and the other end curved downward and downward to the gas inlet valve; The main cooling water pipe is disposed in a space between the distribution pipe and the main feed pipe.

In one embodiment, the main feed pipe and the main cooling water pipe are detachably coupled to each other by a fixing member.

In this case, a fixing block is formed on the outer periphery of the main feed pipe, a supporting block is formed on the upper surface of the main cooling water pipe, and the fixing member is engaged with the inner surface of the fixing block and the upper surface of the supporting block.

The fixed block may include a lower block surrounding the outer periphery of the main feed pipe and an upper block surrounding the upper periphery of the main feed pipe and being detachably coupled to the lower block by a fastener.

The support block may be welded to the upper surface of the main cooling water pipe.

In the pipeline arrangement structure of the dual fuel engine of the present invention, a connecting pipe for supplying the gaseous fuel to the main feed pipe is disposed in a form extending vertically downward from the lower end of the main feed pipe at a position adjacent to the side of the engine block .

According to the fuel gas pipe arrangement structure for a dual fuel engine according to the present invention, the cylinder head of the engine, the main feed pipe, and the like are constructed in a compact structure with a simple structure while vertically lifting each element without interfering with each other, Therefore, it is possible to conveniently carry out the removal and installation of the engine and maintenance during use.

1 is a view showing a gas fuel supply circuit provided on the engine side of a dual fuel engine.
2 is a schematic view showing a pipeline arrangement structure of a dual fuel engine.
3 is a perspective view of the main part of Fig.
4 is a front view of Fig.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a piping arrangement structure of a dual fuel engine according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic view showing a pipeline arrangement structure of a dual fuel engine.

2, the dual fuel engine includes a cylinder head 2 mounted on an upper portion of an engine block 20, and each cylinder head 2 includes a cylinder head block 30 mounted on an engine block 20, And cylinder head covers (40, 50) mounted on top of the cylinder head block (30).

The cylinder head block 30 forms a combustion chamber in a lower portion thereof, and an intake / exhaust valve device, a pilot injector, and the like are installed.

The cylinder head covers (40, 50) cover the upper portion of the cylinder head block (30), and a cam device or the like is installed inside. Although the engine of the type having the cylinder head covers 40, 50 of the two-layer structure is shown in the figure, there is also an engine of the type in which the cylinder head cover of the single layer structure is installed. In the case of the single layer structure, Functions and elements to the cylinder head block 30. Thus, although the cylinder head covers 40, 50 herein are given two reference numerals separately, they may be two elements as well as one element.

The gas fuel supply line attached to the dual fuel engine includes a connection pipe 110 to which a gas supply line from an external supply system including a gas storage tank, a pump, and a gas pipe line is connected, And a distribution pipe 140 branched from the main feed pipe 120 and connected to each of the cylinder heads 2. The main feed pipe 120 is connected to the main feed pipe 120,

3, a gas inflow valve (GAV) 160 is installed at an end of the distribution pipe 140. The gas inflow valve 16 is mounted on the cylinder head block 30, Adjust the gas volume.

3 and 4 show the piping structure of the dual fuel engine according to the present invention in more detail.

3 and 4, the gas fuel main feed pipe 120 is provided at an upper portion of the cylinder head 2 in the outward direction (rightward direction in the figure), that is, above the diagonal direction, and the cylinder head 2 And are arranged long in the aligned direction.

In more detail, the main feed pipe 120 has a line extending vertically from the inner end of the main feed pipe 120 in the left-right direction to the outer end of the cylinder head block 30 And the lower end of the main feed pipe 120 is positioned in the upper part of the cylinder head cover 40, 50 in the up-and-down direction Place it higher than the surface.

In this case, a line extending vertically from the outer end of the cylinder head covers 40 and 50 and a line extending perpendicularly from the inner end of the main feed pipe 120 maintain the gap G1.

The connecting pipe 110 for supplying the gaseous fuel to the main feed pipe 120 is arranged to extend vertically downward from the lower end of the main feed pipe 120 at a position adjacent to the side surface of the engine block 20. [ According to the configuration in which the connecting pipe 110 is vertically disposed adjacent to the side of the engine block 20 along the shape of the engine block 20, the channel connected to the main feed pipe 120 can be simplified, Can be implemented compactly.

According to the arrangement structure of the main feed pipe 120 as described above, when the cylinder head covers 40 and 50 and the cylinder head block 30 are pulled up vertically and pulled out from the engine block 20, It is possible to remove only the cylinder head 2 while leaving the main feed pipe 120 as it is, and the lifting operation can also be simplified.

A distribution pipe 140 is connected to the main feed pipe 120 and the gas inlet valve 160 on the upper surface of the cylinder head block 30. The distribution pipe 140 is a passage for distributing the gaseous fuel supplied to the main feed pipe 120 for each cylinder. The gas inlet valve 160 regulates the amount of gaseous fuel supplied to the gas injector from the distribution pipe 140.

The main cooling water pipe 180 is a conduit for circulating the cooling water to the cooling water circulation passage such as the engine block, the cylinder block, the cylinder head 20, and the like.

In one embodiment, the main cooling water pipe 180 is formed so that the outer end of the main cooling water pipe 180 between the cylinder head covers 40, 50 and the main feed pipe 120 is perpendicular Of the main feed pipe 120 is spaced further inward than a line extending vertically from the inner end of the main feed pipe 120 while the gap G3 is maintained, As shown in Fig. Therefore, the main cooling water pipe 180 can be lifted upright vertically, and no interference with the main feed pipe 120 occurs even when the main cooling water pipe 180 is lifted together with the cylinder head block 30.

The cooling water distribution pipe 190 is connected to the water jacket inlet formed on the upper surface of the main cooling water pipe 180 and the cylinder head block 30. Therefore, the cooling water supplied to the main cooling water pipe 180 is circulated through the water jacket of the cylinder head 2 and the water jacket of the engine block through the cooling water distribution pipe 190.

In one embodiment, the distribution pipe 140 includes a main pipe 120 having one end connected to the side of the main feed pipe 120 and the other end connected to the gas inflow valve 160, It consists of a curved line. This is because the main feed pipe 120 is located in the upper portion of the cylinder head cover 40, 50 in the diagonal direction. Accordingly, one end (upper end) of the 'A' self-bending tube is detachably coupled to the main feed pipe 120 and the other end (lower end) is detachably coupled to the upper surface of the gas inlet valve 160.

In this case, the main cooling water pipe 180 is arranged in a space between the distribution pipe 140 and the main feed pipe 120 to be compact.

The main feed pipe 120 and the main cooling water pipe 180 are detachably coupled to each other by a fixing member 210 so that the main feed pipe 120 and the main cooling water pipe 180 can be detached from each other while being structurally supported and stably supported.

A fixing block 220 is formed on the outer circumference of the main feed pipe 120 and a supporting block 182 is formed on the upper surface of the main cooling water pipe 180. The fixing member 210 is fixed to the fixing block 220 220 and the upper surface of the support block 182 by means of a fastener 212.

The fixed block 220 includes a lower block 222 surrounding the outer periphery of the main feed pipe 120 and a lower block 222 surrounding the outer periphery of the main feed pipe 120, And an upper block 224 detachably coupled by a fastener 226.

Further, the support block 182 can be formed in a simple structure by welding and joining to the upper surface of the main cooling water pipe 180.

3 and 4, reference numeral 200 denotes an exhaust pipe connected to the exhaust port of the cylinder head 2.

The distribution pipe 140 is separated from the main feed pipe 120 and the cylinder head 2 and includes a main feed pipe 120 and a fixing member 210 supporting the main cooling water pipe 180 It is removable.

Therefore, when the main feed pipe 120 is to be replaced or repaired, the fixing member 210 may be separated from the fixing block 220, separated from the supporting block 180, or both, The main feed pipe 120 and the distribution pipe 140 attached to the main feed pipe 120 can be vertically lifted and removed entirely.

When the main cooling water pipe 180 is to be replaced or maintained, the fixing member 210 is removed and the distribution pipe 140 is removed. Then, the cooling water distribution pipe 190 is connected to the cylinder head 2, The main cooling water pipe 180 and the cooling water distribution pipe attached to the main cooling water pipe 180 can be vertically lifted and removed.

The cylinder head block 30 and the cylinder head covers 40 and 50 and the main cooling water pipe 180 can be easily lifted and removed at the same time without detaching the main feed pipe 120. [

That is, according to the present invention, when only the distribution pipe 140 and the fixing member 210 are detached, all of the obstruction is removed so that the main cooling water pipe 180 (180) together with the cylinder head block 30 and the cylinder head covers 40, ) Can be easily lifted vertically without being disturbed.

It is also possible to detach the cylinder head 2 while keeping it to the distribution pipe 140 and the fixing member 210. That is, it is possible to easily remove only the connection portion of the main feed pipe 120 of the distribution pipe 140 and separate the connection portion between the fixing member 210 and the main feed pipe 120 and lift them vertically.

The foregoing is a description of certain preferred embodiments of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein, but may be modified and altered without departing from the spirit and scope of the invention as defined in the appended claims.

2: Cylinder head
20: engine block
30: Cylinder head block
40, 50: Cylinder head cover
52a, 52b: mounting lug mounting hole
54a and 54b: lugs,
110: connecting pipe
120: Main feed pipe
140: Distribution pipe
160: gas inlet valve
180: Main cooling water pipe
182: Support block
190: Cooling water distribution pipe
200: Exhaust pipe
210: Fixing member
212: Fastener
220: fixed block
222:
224: upper block
226: Fastener

Claims (7)

A double fuel engine in which a cylinder head block 30 is mounted on the cylinder block 30 at the top of the engine block 20 and cylinder head covers 40 and 50 are mounted on the top of the cylinder head block 30,
A line extending vertically from the inner end of the main feed pipe 120 in the left-right direction extends in the outward direction from a line extending vertically from the outer end of the cylinder head block 30 And the lower end of the main feed pipe 120 is disposed at a position higher than the upper surface of the cylinder head covers 40 and 50 in the up and down direction,
The main feed pipe 120 is connected to the gas inlet valve 160 on the upper surface of the cylinder head block 30 via the distribution pipe 140,
A line extending vertically from the outer end of the main cooling water pipe 180 between the cylinder head covers 40 and 50 and the main feed pipe 120 in the right and left direction is connected to the main feed pipe 180, The gap G3 is maintained at a position further away from the line extending vertically from the inner end of the pipe 120 so as to be located at the upper portion of the cylinder head block 30 in the vertical direction ,
And the cooling water distribution pipe (190) is connected from the main cooling water pipe (120) to the water jacket inlet on the upper surface of the cylinder head block (30). The method according to claim 1,
The distribution pipe 140 is formed of a curved shape having one end connected to the side of the main feed pipe 120 and the other end curved downward to the gas inlet valve 160,
Wherein the main cooling water pipe (180) is disposed in a space between the distribution pipe (140) and the main feed pipe (120). The method according to claim 1,
Wherein the main feed pipe (120) and the main cooling water pipe (180) are detachably coupled to each other by a fixing member (210). The method of claim 3,
A fixing block 220 is formed on an outer circumference of the main feed pipe 120. A supporting block 182 is formed on an upper surface of the main cooling water pipe 180. The fixing member 210 is fixed to the fixing block 220 ) And the upper surface of the support block (182). 5. The method of claim 4,
The fixing block 220 includes a lower block 222 that surrounds the outer periphery of the main feed pipe 120 and a lower block 222 that surrounds the outer periphery of the main feed pipe 120 and has a fastener 226 And an upper block (224) detachably coupled to the upper block (224). 5. The method of claim 4,
Wherein the support block (182) is welded to an upper surface of the main cooling water pipe (180). 7. The method according to any one of claims 1 to 6,
The connection pipe 110 for supplying the gaseous fuel to the main feed pipe 120 is arranged to extend vertically downward from the lower end of the main feed pipe 120 at a position adjacent to the side surface of the engine block 20 Features of the dual fuel engine pipeline layout.

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